Great for seasonal maintenance and to have as a spare for unexpected failures. Impellers are the heart of an engines cooling system. Running through silty or sandy water or running a pump dry can quickly ruin an impeller and cause the engine to overheat. Regular inspection and replacement of the impeller is recommended and will keep your Mercury outboards cooling system running in top form. Every Sierra impeller is engineered to meet or exceed manufacturers specifications to give boaters and technicians the confidence of the proper fit and function. Having a spare is an excellent way to save the day in the event of an unexpected failure. Key Features Impeller is engineered to meet or exceed manufacturer specifications to ensure fit and function Fits: Mercury/Mariner shiftable 3.3hp 1993 & Up, 4/5hp 2-cycle 1987 & Up, & 4/5/6hp 4-Stroke 1999 & Up Sierra Part Number 18-3098 Application Table ApplicationOEM Part NumberMallory9-45302, 9-45302-10Mercury Marine47-161543, 47-16154The Sierra Engine Parts SelectorIn addition to impeller kits, we offer a wide variety of other engine parts manufactured by Sierra. To see if we have the part you need, see ourEngine Parts Selector, where you can search by engine make, serial number and model or year of manufacture.